Electric upsetting or jolting machine



Nov. 20, 1928.

F. BRERO ELECTRIC UPSETTING OTR JOLTING MACHINE Filed Oct. 25, 1926 Patented Nov. :1Q-8 A UNITED STATES rnazcymzsoo nannopor TURIN, ITALY.

ELECTIC .UPSETTING B JOLTING MACHINE.

Application inea october 25,1928, serial No. Macao, and in Italy November e, 1925.

This invention relates to an upsetting or. jolting machine wherein the work plece 1s heated by electricity. The machine consists v pf a clamp gripping the work piece and forming the contact for one of the poles of a source of electricity whileanother device pushes the work piece against a stopconnectedto the.-

other electrode. The work piece is thus heated in the Vzone comprised between the gripping device and the stop and is upsetunder the actiomof pressure. The pressure for closing the clamping device and for advanc-v ing the work piece is conveniently generated by meansy of ya hydraulicl arrangement which it is possible to adj ust exactly the maximum stress and therefore toeffect jolting exactly at the desired temperature, 1. e. Vat a lower temperature with higher pressure and vice versa. 20 -The accompanying drawin shows by way of example a constructional crm of the machine according to the invention.

Figure 1 is a side View. Figure 2'is a front view.

Figure 3 shows a detail to an enlarged scale. 1 denotes a bed on which Aare mounted two electrically insulated plates 2 and 3 connected to the terminalsof a transformer or other the plate 2 is mounted a water'cooled-block 4 vfast with a piece 5l serving as an anvil for the piece to be upset and adjustable by means of a set screw 6 mounted on a support 7. l On the plate 3 is mounted a hydraulic cylinder 8, the piston 9 ofy which is fast with a block 10 and is held in a lifted `position by a lever mechanism 23 lwith a .return spring 24. The

block 10 carries an interchangeable half-bush 11 lying above a second half-bush 11 mounted in a block 12 secured on plate 3.

The blocks 1() and 12 are water-cooled. On the bed 1 is further adjustably mounted a support 13 in which is movable a spindlev 14 provided at one end with an adjustable head 15 and connected at vits other end to a piston ro'd 16 of a hydraulic cylinder 18 somesource of electricity of suitable voltage. On

open in the position of rest, so that no pressure is generated inside Ithe cylinders. The ta is provided with an operating handle 27. he upsetting or jolting machine'works as follows: d

The work piece e. g. a bar 25 for making an automobile valve isplaced into the bush 11 between the anvil 5 and head 15 whereafter I close the tap 22'. The pressure rises in the cylinders 8 and 18 and the piston 9'pushes the block 10 and bush 11 downwards clam ing the bar 25; at the same time the spin e 14- advances under the action of the piston rod by 16 and efficiently presses the bar against the anvil 5. By feeding current to plates 2 and 3 through a switch 28, the bar portion between the bush A1111 and the anvil 5 is heated a-nd softens until its resistance is lower than the pressureofspindle 14. Upsetting then commences and a headv 25 is formed that increases inV size as long as the spindle presses the bar, this ceasing when the projection 14 of the spindle rests against the support 13.

The length of stroke'is conveniently adjusted in order to form at the end of the bar a head of the exactly required size for obtaining therefrom the valve cone by asimple stam ing operation.

I t us upset the work piece with the smallest waste of material `and the valve lafter stamping re uires no further treatment except boring t e seat and spindle. psetting cannot exceed theI predetermined limit as the spindle stops when the projection 14?. reaches the support 13, whereupon the excess pressure is discharged through an automatic valve of the pump. A

When a' hydraulic accumulator is available it may be utilized for feeding the cylinders. These latter are then provided with inlet valves or cocks arranged to open whenv tap 22 closes and vice versa.

Any suitableliqu'id or fluid e. g. air or lother gas can be used in lieu of waterfor the transmission of pressure.

Besides the valve mentioned byY wayrof example'theupsettin machine can be used for the production o an endless number ofA articles.

What I claim is:

An upsetting or jolting machine comprising a bed, two insulated plates mounted on sald bed and connected to the terminals of a source of electricity, a ram mounted on one piston connected to the piston of a second of said plates and the piston whereof actuates ram and adjustable means for regulating the ahalf-bush cooperating with vanother halfstroke of said piston. 10

bush for gripping the Work piece, an adjust- In testimony that I claim the foregoing as 5 able anvil arranged on the other plate, a' my invention I have signed my name.

guide and stop support situated on thebed,

a plunger axially slidable in said support, a FRANCESCO BRERO. 

